Arrow RK12BD03 Polished Brass US3 Grade 2 Storeroom RK Series Cylindrical Knobs, specially designed for multi family housing, as well as light commercial applications. These knobs are ANSI, A156.2, Series 4000, Grade 2 certified, it's UL listed for 3 hour, "A" labeled single swinging doors, and the knobs conform to ADA requirements. This lock features a 2-3/8" backset , 1" x 2-1/4" latch front, a 1/2" throw, it fits standard doors 1-3/8" to 1-3/4" inches thick, the Strike is 4-7/8" inches, and it is non handed, so the knob can be used on left or right hand applications. This lock is constructed of cold rolled steel with zinc dichromate finish for corrosion resistance. For installation the door requires a standard 1-1/8" bore hole through the door. RK Roses are wrought brass 2-1/2" inch diameter, and the total projection from the face of the door is 2-3/4" inches out.

Storeroom: Latch operated by rotating inside Knob or key in outside Knob. Outside Knob always fixed.